2201221221 has 4 divisors (see below), whose sum is σ = 2934961632. Its totient is φ = 1467480812.

The previous prime is 2201221207. The next prime is 2201221223. The reversal of 2201221221 is 1221221022.

2201221221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2201221221 - 2⁵ = 2201221189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2201221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2201221223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 366870201 + ... + 366870206.

It is an arithmetic number, because the mean of its divisors is an integer number (733740408).

Almost surely, 2^2201221221 is an apocalyptic number.

It is an amenable number.

2201221221 is a deficient number, since it is larger than the sum of its proper divisors (733740411).

2201221221 is an equidigital number, since it uses as much as digits as its factorization.

2201221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 733740410.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 2201221221 is about 46917.1740517265. The cubic root of 2201221221 is about 1300.8320553040.

Adding to 2201221221 its reverse (1221221022), we get a palindrome (3422442243).

The spelling of 2201221221 in words is "two billion, two hundred one million, two hundred twenty-one thousand, two hundred twenty-one".